82 VETERINARY SURGICAL THERAPEUTICS. 
adapted ; the screw H and the spigot B are now opened. The bellows 
are worked, the vapors of essence which escape by the lateral open- 
ings of the siphon are lighted, gradually the spigot B is closed until 
Fig, 39—Paquelin’s cautery, 
the flames do not come out any more. Soon the central tube red- 
dens ; and the siphon being then closed by the screw H, the point 
of the cautery is soon seen becoming red in its turn. As the 
quantity of essence diminishes in the sponge, to keep up a sufficient 
quantity of heat, the spigot B has to be opened gradually. 
This cautery is very handy; it permits rapid application of firing 
in superficial deep points ; but though the needle is made of iridized 
platinum, it bends just like that of the Paquelin cautery. This has 
